Entity Framework Lambda 实现多列Group by,并汇总求和

var result = DataSummaryRepository.FindBy(x => x.UserID == argMemberNo && x.SummaryDate <= argEndDate && x.SummaryDate >= argStarDate).OrderByDescending(x => x.SummaryDate).GroupBy(x => new { x.SummaryDate, x.UserID }).Select(g => new
            {
                PV = g.Sum(x => x.PV),
                UV = g.Sum(x => x.UV),
                OrderQunantity = g.Sum(x => x.OrderQunantity),
                OrderAmount = g.Sum(x => x.OrderAmount),
                CommissionEstimate = g.Sum(x => x.CommissionEstimate),
                AvaliableCommission = g.Sum(x => x.AvaliableCommission),
                HistoryCommission = g.Sum(x => x.HistoryCommission),
                SummaryDate = g.Key.SummaryDate,
                UserID = g.Key.UserID
            });